The exam pattern for NMAT has been modified, and the cut-off is not predictable until the level of questions is known. There is very little waitlist movement in NMIMS Mumbai and it is difficult to convert with a 1900 merit number. However, there are other campuses that you can consider.
You can take another attempt at NMAT this year and try to perform better in the CDPI rounds, which have a considerable impact on the merit rank.